Free Security Incident & Event Management (SIEM) Tools
SIEM tools collect logs from across your systems, correlate them, and alert on the patterns that signal an attack. The free tools here let small teams get real detection and the log retention auditors look for without enterprise license costs.
- 6 free solutions listed
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Graylog Small Business
Security Incident & Event Management (SIEM)The Perfect Mix of IT Ops & Cybersecurity Log Management. Built on the Graylog Enterprise Platform, Graylog Small Business combines IT Ops & Cybersecurity capabilities in an all-in-one log management solution ideal for organizations with less than 50 employees.
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wazuh
Security Incident & Event Management (SIEM)Wazuh is a free and open source security platform that unifies XDR and SIEM capabilities. It protects workloads across on-premises, virtualized, containerized, and cloud-based environments. Wazuh helps organizations and individuals to protect their data assets against security threats. It is widely used by thousands of organizations worldwide, from small businesses to large enterprises.
JupiterOne
Security Incident & Event Management (SIEM)Manage all of your core security and compliance operations from one place. With JupiterOne, you can perform access reviews, code repo vulnerabilities, general vulnerability management, endpoint compliance, run executive security reports and gather compliance evidence. All of the data is collected and classified automatically into a database you can search, visualize, alert and analyze. Spend 10X less time on the tedious.
NXLog Community Edition
Security Incident & Event Management (SIEM)NXLog is a log collection tool. When browsing websites or using online applications, messages are issued to a console log (errors, alerts, messages and event tracking items). NXLog collects these logged messages and tells users if anything suspicious happened during their visit.
LOGalyze
Security Incident & Event Management (SIEM)LOGalyze is an open source log management and network monitoring platform. The tool collects event logs from Windows or Linux networks. LOGalyze classifies logs by source host, severity, and type. This makes analyzing logs for threats or vulnerabilities more efficient.
Graylog Open Source
Security Incident & Event Management (SIEM)Graylog collects, enhances, stores, and analyzes log data from websites and web applications. This information is reviewed to check error log messages and event tracking messages for security issues.
What Security Incident & Event Management (SIEM) Tools Do
Security information and event management tools collect logs from every system that matters (identity provider, cloud accounts, endpoints, firewalls, applications), normalise them into one searchable store, correlate events across sources, and alert when a pattern looks like an attack. A SIEM is where "someone logged in from a new country and then downloaded the customer database" becomes one alert instead of two unrelated log lines.
Commercial SIEMs are priced for enterprises, but the open-source engines behind them are free. The tools on this page cover log collection agents, search and dashboard platforms, detection rule libraries, and lightweight SIEMs sized for a few dozen systems, which is enough for a small business to meet the logging and monitoring requirements in SOC 2, ISO 27001, and CMMC.
How to Choose a Security Incident & Event Management (SIEM) Tool
- Decide which log sources matter (identity, cloud, endpoints, your product) and confirm the tool can ingest all of them before installing it.
- Choose a platform with a maintained detection rule library; writing rules from scratch is where SIEM projects fail.
- Plan retention: 12 months is a common compliance expectation, and storage is the real cost of a free SIEM.
- Route high-severity alerts to a person with a defined response time, or the SIEM is only a log archive.
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Free ISO 27001 Gap AssessmentSecurity Incident & Event Management (SIEM) Tools: Frequently Asked Questions
Does a small business need a SIEM?
It needs the outcome a SIEM provides: centralised logs, retention, and alerts on suspicious activity. For fewer than 50 systems that can be a lightweight open-source SIEM or the built-in security tooling of your cloud and identity provider. The frameworks require the capability, not the product category.
How long should security logs be retained?
At least 12 months is the common expectation across SOC 2, ISO 27001, PCI DSS, and cyber insurance questionnaires, with the most recent 90 days searchable quickly. Some regulated sectors require longer.
What is the difference between a SIEM and log management?
Log management collects, stores, and searches logs. A SIEM adds correlation across sources, detection rules, and alerting. Many free tools start as log management and become a SIEM once detection rules and alert routing are added.
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